The check-engine light means the vehicle’s onboard diagnostics system detected a fault. It does not identify the exact repair by itself.
Steady versus flashing
A steady light often allows careful driving while you arrange diagnosis. A flashing light can indicate an active misfire and needs prompt attention.
Useful first steps
- Check the fuel cap is present and tightened after refueling.
- Note changes in how the vehicle runs, smells, or sounds.
- Do not clear codes before recording them for diagnosis.
A scan-tool code is a starting point, not a parts-replacement instruction. Use a qualified technician when the vehicle runs poorly, warning lights multiply, or a flashing light appears.